I've this thing for scents ...

List of woods
http://en.wikipedia.org/wiki/List_of_woods

Citrus varieties
http://en.wikipedia.org/wiki/Citrus

Apple varieties
http://en.wikipedia.org/wiki/List_of_apple_cultivars

Pear varieties
http://en.wikipedia.org/wiki/List_of_pear_cultivars

Cherry, peach, apricot, plum, grape, kiwi varieties
http://www.summitproduceinc.com/index.php/products/

Vegetable varieties
http://www.grow-it-organically.com/carrot-varieties.html

List of rose species
http://en.wikipedia.org/wiki/List_of_Rosa_species

The Berry Fest...
http://www.buzzle.com/articles/types-of-berries-list-of-different-kinds-of-berries.html

...